Seven contributions explore issues of the design of online virtual union catalogues in libraries made possible by the widespread implementation of the NISO Z39.50 standard. Topics include: the basics of Z39.50, a technical overview, possible drawbacks to the virtual union catalog, the State of Iowa Library Online (SILO) experience; future trends; and a vendor panel discussion on their experiences of implementing Z39.50. Annotation c. by Book News, Inc., Portland, Or.

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